/usr/include/boost/iostreams/filter/ is in libboost1.55-dev 1.55.0+dfsg-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/boost/iostreams/filter/aggregate.hpp
/usr/include/boost/iostreams/filter/bzip2.hpp
/usr/include/boost/iostreams/filter/counter.hpp
/usr/include/boost/iostreams/filter/grep.hpp
/usr/include/boost/iostreams/filter/gzip.hpp
/usr/include/boost/iostreams/filter/line.hpp
/usr/include/boost/iostreams/filter/newline.hpp
/usr/include/boost/iostreams/filter/regex.hpp
/usr/include/boost/iostreams/filter/stdio.hpp
/usr/include/boost/iostreams/filter/symmetric.hpp
/usr/include/boost/iostreams/filter/test.hpp
/usr/include/boost/iostreams/filter/zlib.hpp